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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d292e5640d71acba84fa9434bea1c4472adb14aeef6d758771f11a6ce21546e' 
  AND token = 'GhKZla6ThnHO5v2xMzQq2zaNT7LsAmDIthb2ycYcOSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}